MLB.com beat writer Brian McTaggart blogs about all things Astros.

Astros set Tri-City, Greeneville rosters

The Astros have set the preliminary 2012 Minor League rosters for their Rookie Level Tri-City, Greeneville and Gulf Coast League clubs. The announcement was made by Astros director of player development Fred Nelson.

The rosters are subject to change and will not be officially finalized until each club begins league play. The Tri-City and Gulf Coast League clubs are both scheduled to begin their respective 2012 seasons on June 18. The Greeneville Astros will begin their 2012 season on June 19.

The Astros are currently the only Major League team that has winning records at all four of their full-season affiliates. Triple-A Oklahoma City, Double-A Corpus Christi, Class A Lancaster and Class A Lexington have combined for a 144-118 (.550) record on the season. The Astros combined affiliate winning percentage ranks third among Major League clubs.

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